Finding the Third Proportional to 3,989,564 and 8,776,168

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989,564 : 8,776,168 = 8,776,168 : x
2. Step 2: Convert to fraction form
   3,989,564/8,776,168 = 8,776,168/x
3. Step 3: Cross multiply
   3,989,564x = 8,776,168 × 8,776,168
4. Step 4: Simplify right side
   3,989,564x = 77,021,124,764,224
5. Step 5: Solve for x
   x = 77,021,124,764,224/3,989,564
6. Step 6: Final answer
   x = 19,305,649.63